/**
 * Color picker provides a simple color palette for choosing colors. The picker can be rendered
 * to any container. The available default to a standard 40-color palette; this can be customized
 * with the {@link #colors} config.
 *
 * Typically you will need to implement a handler function to be notified when the user chooses
 * a color from the picker; you can register the handler using the {@link #event-select} event,
 * or by implementing the {@link #handler} method.
 *
 *     @example
 *     Ext.create('Ext.picker.Color', {
 *         value: '993300',  // initial selected color
 *         renderTo: Ext.getBody(),
 *         listeners: {
 *             select: function(picker, selColor) {
 *                 alert(selColor);
 *             }
 *         }
 *     });
 */
Ext.define('Ext.picker.Color', {
    extend: 'Ext.Component',
    requires: 'Ext.XTemplate',
    alias: 'widget.colorpicker',
    alternateClassName: 'Ext.ColorPalette',

    focusable: true,

    /**
     * @cfg {String} [componentCls='x-color-picker']
     * The CSS class to apply to the containing element.
     */
    componentCls: Ext.baseCSSPrefix + 'color-picker',

    /**
     * @cfg {String} [selectedCls='x-color-picker-selected']
     * The CSS class to apply to the selected element
     */
    selectedCls: Ext.baseCSSPrefix + 'color-picker-selected',

    /**
     * @cfg {String} itemCls
     * The CSS class to apply to the color picker's items
     */
    itemCls: Ext.baseCSSPrefix + 'color-picker-item',

    /**
     * @cfg {String} value
     * The initial color to highlight (should be a valid 6-digit color hex code
     * without the # symbol). Note that the hex codes are case-sensitive.
     */
    value: null,

    /**
     * @cfg {String} clickEvent
     * The DOM event that will cause a color to be selected. This can be any valid event name
     * (dblclick, contextmenu).
     */
    clickEvent: 'click',

    /**
     * @cfg {Boolean} allowReselect
     * If set to true then reselecting a color that is already selected fires the
     * {@link #event-select} event
     */
    allowReselect: false,

    /**
     * @property {String[]} colors
     * An array of 6-digit color hex code strings (without the # symbol). This array can contain
     * any number of colors, and each hex code should be unique. The width of the picker
     * is controlled via CSS by adjusting the width property of the 'x-color-picker' class
     * (or assigning a custom class), so you can balance the number of colors with the width setting
     * until the box is symmetrical.
     *
     * You can override individual colors if needed:
     *
     *     var cp = new Ext.picker.Color();
     *     cp.colors[0] = 'FF0000';  // change the first box to red
     *
     * Or you can provide a custom array of your own for complete control:
     *
     *     var cp = new Ext.picker.Color();
     *     cp.colors = ['000000', '993300', '333300'];
     */
    colors: [
        '000000', '993300', '333300', '003300', '003366', '000080', '333399', '333333',
        '800000', 'FF6600', '808000', '008000', '008080', '0000FF', '666699', '808080',
        'FF0000', 'FF9900', '99CC00', '339966', '33CCCC', '3366FF', '800080', '969696',
        'FF00FF', 'FFCC00', 'FFFF00', '00FF00', '00FFFF', '00CCFF', '993366', 'C0C0C0',
        'FF99CC', 'FFCC99', 'FFFF99', 'CCFFCC', 'CCFFFF', '99CCFF', 'CC99FF', 'FFFFFF'
    ],

    /**
     * @cfg {Function/String} handler
     * A function that will handle the select event of this picker. The handler is passed
     * the following parameters:
     *
     * - `picker`: ColorPicker
     *
     *   The {@link Ext.picker.Color picker}.
     *
     * - `color`: String
     *
     *   The 6-digit color hex code (without the # symbol).
     * 
     * @controllable
     */

    /**
     * @cfg {Object} scope
     * The scope (`this` reference) in which the `{@link #handler}` function will be called.
     *
     * Defaults to this Color picker instance.
     */

    colorRe: /(?:^|\s)color-(.{6})(?:\s|$)/,

    /* eslint-disable indent, max-len */
    renderTpl: [
        '<tpl for="colors">',
            '<a href="#" role="button" class="color-{.} {parent.itemCls}" hidefocus="on">',
                '<span class="{parent.itemCls}-inner" style="background:#{.}">&#160;</span>',
            '</a>',
        '</tpl>'
    ],
    /* eslint-enable indent, max-len */

    /**
     * @event select
     * Fires when a color is selected
     * @param {Ext.picker.Color} this
     * @param {String} color The 6-digit color hex code (without the # symbol)
     */

    /**
     * @private
     */
    initComponent: function() {
        var me = this;

        me.callParent(arguments);

        if (me.handler) {
            me.on('select', me.handler, me.scope, true);
        }
    },

    /**
     * @private
     */
    initRenderData: function() {
        var me = this;

        return Ext.apply(me.callParent(), {
            itemCls: me.itemCls,
            colors: me.colors
        });
    },

    onRender: function() {
        var me = this,
            clickEvent = me.clickEvent;

        me.callParent(arguments);

        me.mon(me.el, clickEvent, me.handleClick, me, { delegate: 'a' });

        // always stop following the anchors
        if (clickEvent !== 'click') {
            me.mon(me.el, 'click', Ext.emptyFn, me, { delegate: 'a', stopEvent: true });
        }
    },

    /**
     * @private
     */
    afterRender: function() {
        var me = this,
            value;

        me.callParent(arguments);

        if (me.value) {
            value = me.value;
            me.value = null;
            me.select(value, true);
        }
    },

    /**
     * @private
     */
    handleClick: function(event) {
        var me = this,
            color;

        event.stopEvent();

        if (!me.disabled) {
            color = event.currentTarget.className.match(me.colorRe)[1];
            me.select(color.toUpperCase());
        }
    },

    /**
     * Selects the specified color in the picker (fires the {@link #event-select} event)
     * @param {String} color A valid 6-digit color hex code (# will be stripped if included)
     * @param {Boolean} [suppressEvent=false] True to stop the select event from firing.
     */
    select: function(color, suppressEvent) {
        var me = this,
            selectedCls = me.selectedCls,
            value = me.value,
            el, item;

        color = color.replace('#', '');

        if (!me.rendered) {
            me.value = color;

            return;
        }

        if (color !== value || me.allowReselect) {
            el = me.el;

            if (me.value) {
                item = el.down('a.color-' + value, true);
                Ext.fly(item).removeCls(selectedCls);
            }

            item = el.down('a.color-' + color, true);
            Ext.fly(item).addCls(selectedCls);
            me.value = color;

            if (suppressEvent !== true) {
                me.fireEvent('select', me, color);
            }
        }
    },

    /**
     * Clears any selection and sets the value to `null`.
     */
    clear: function() {
        var me = this,
            value = me.value,
            el;

        if (value && me.rendered) {
            el = me.el.down('a.color-' + value, true);
            Ext.fly(el).removeCls(me.selectedCls);
        }

        me.value = null;
    },

    /**
     * Get the currently selected color value.
     * @return {String} value The selected value. Null if nothing is selected.
     */
    getValue: function() {
        return this.value || null;
    }
});
